Hinge Anchoring Studs for Thin-Walled Container Closures
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Solution Overview
Problem
Existing closure devices for containers, particularly those intended for human consumption, face challenges in achieving strong anchoring of the cap to the base while maintaining a thin wall thickness, often requiring oversizing to ensure safety, which leads to excessive material consumption.
Innovation Solution
A two-part closure device with a cap and base connected by a hinge, featuring inner and outer positioning studs that maintain the tongue's precise positioning during molding, ensuring strong anchoring without the need for oversizing the base thickness, and allowing for the use of different plastic materials compatible for surface bonding and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base thickness is increased to ensure strong anchoring of the hinge, then consumer safety and mechanical strength are improved, but material consumption increases significantly
Solution Approach 1:
Positioning studs are integrated into the hinge assembly before molding, pre-establishing precise positioning features that guide the base material during the molding process. This preliminary positioning ensures optimal material distribution and anchoring strength without requiring excessive base thickness
Solution Approach 2:
The invention changes the geometric parameters of the anchoring structure by adding radially protruding positioning studs that extend from the hinge. These studs create specific engagement features with the base that dramatically improve anchoring strength-to-volume ratio, allowing thin-walled bases to achieve the same holding power as much thicker conventional designs
2Reliability
If the base thickness is increased to prevent tearing of the tongue and cap, then reliability is improved, but device complexity and material cost increase
Solution Approach 1:
Positioning studs are pre-formed on the hinge assembly before the molding process, establishing precise positioning features that guide base material flow and ensure uniform wall thickness. This preliminary action prevents thin spots and weak points that could lead to tearing, maintaining high reliability without requiring overall thickness increase
Solution Approach 2:
The positioning studs create localized reinforcement zones at critical anchoring points where the hinge connects to the base. This local quality enhancement provides maximum strength precisely where needed to prevent tearing, while the rest of the base can maintain thin walls to reduce material consumption
Data Source
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AI summary
The invention relates to a capping device (10) comprising a unitary base (14) comprising a tubular peripheral wall (18) for attaching to the neck of a container, wherein the tubular peripheral attachment wall (18) defines a reference geometrical axis (X-X) of the device, and a unitary cap (12) having a hinge (16) to be pivotably connected onto the base so as to enable the pivotal movement of the cap (12) between at least an open position and a closed position, wherein the hinge (16) comprises an anchoring tab (50) embedded in the base (14). The tab (50) has at least one inner positioning lug (52) oriented radially inward and flush with an inner radial surface (62) of the base, and at least one outer positioning lug (54) oriented radially outward and flush with the outer radial surface (68) of the base. The positioning lugs (52, 54) enable the positioning of the tab (50) between two walls of the mold to be maintained during the injection molding of the base around the tab (50). The positioning lugs further contribute to the anchoring of the shape of the tab (50) in the material constituting the base (14).